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i_o know_v not_o the_o author_n but_o it_o seem_v he_o have_v deeply_o consider_v this_o question_n than_o other_o man_n for_o in_o the_o introduction_n to_o his_o book_n he_o say_v that_o man_n have_v pre-engaged_n themselves_o to_o maintain_v certain_a principle_n of_o their_o own_o invention_n and_o be_v therefore_o unwilling_a to_o receive_v any_o thing_n that_o may_v render_v their_o labour_n fruitless_a and_o that_o they_o have_v not_o strict_o enough_o consider_v the_o several_a intervention_n that_o abate_v impede_fw-la advance_v or_o direct_v the_o gravitation_n of_o body_n b._n this_o be_v true_a enough_o and_o he_o himself_o be_v one_o of_o those_o man_n in_o that_o he_o consider_v not_o that_o resistance_n be_v one_o of_o those_o intervention_n which_o abate_v impede_fw-la and_o direct_a gravitation_n but_o what_o be_v his_o supposition_n for_o the_o question_n he_o handle_v a._n his_o first_o be_v that_o as_o in_o a_o pyramid_n of_o brick_n wherein_o the_o brick_n be_v so_o join_v that_o the_o uppermost_a lie_v every_o where_o over_o the_o joint_n or_o cement_n of_o the_o two_o next_o below_o it_o you_o may_v break_v down_o a_o part_n and_o leave_v a_o cavity_n and_o yet_o the_o brick_n above_o will_v stand_v firm_a and_o sustain_v one_o another_o by_o their_o cross_a posture_n so_o also_o it_o be_v in_o wheat_n hailshot_a sand_n or_o water_n and_o so_o they_o arch_v themselves_o and_o thereby_o the_o fish_n be_v every_o way_n secure_v by_o a_o arch_n of_o water_n over_o it_o b._n that_o the_o cause_n why_o fish_n be_v not_o crush_v nor_o hurt_v in_o the_o bottom_n of_o the_o sea_n by_o the_o weight_n of_o the_o water_n be_v the_o water_n arch_v itself_o be_v very_o manifest_a for_o if_o the_o uppermost_a orb_n of_o the_o water_n shall_v descend_v by_o its_o gravity_n it_o will_v tend_v towards_o the_o centre_n of_o the_o earth_n and_o place_n itself_o all_o the_o way_n in_o a_o less_o and_o lesser_a orb_n which_o be_v impossible_a for_o the_o 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those_o several_a tendency_n or_o endeavour_n will_v so_o abate_v impede_fw-la and_o correct_v one_o another_o as_o none_o of_o they_o shall_v gravitate_fw-la which_o be_v grant_v the_o fish_n can_v take_v no_o harm_n wherein_o i_o find_v one_o difficulty_n which_o be_v this_o the_o water_n have_v a_o endeavour_n to_o motion_n every_o way_n at_o once_o methinks_v it_o shall_v go_v no_o way_n but_o lie_v at_o rest_n which_o he_o say_v be_v the_o opinion_n of_o stevinus_n and_o reject_v it_o say_v it_o will_v crush_v the_o fish_n into_o piece_n b._n i_o think_v the_o water_n in_o this_o case_n will_v neither_o rest_v nor_o crush_v for_o the_o endeavour_n be_v as_o he_o say_v intrinsical_a and_o every_o way_n must_v needs_o drive_v the_o water_n perpetual_o outward_a that_o be_v to_o say_v as_o to_o this_o question_n upward_o and_o see_v the_o same_o endeavour_n in_o one_o individual_a body_n can_v be_v more_o way_n at_o once_o than_o one_o it_o will_v carry_v it_o on_o perpetual_o without_o limit_n beyond_o the_o fix_a star_n and_o so_o we_o shall_v never_o more_o have_v rain_n a._n as_o ridiculous_a as_o it_o be_v it_o necessary_o follow_v b._n what_o be_v dr._n wallis_n his_o supposition_n a._n he_o go_v upon_o experiment_n and_o first_o he_o allege_v this_o that_o water_n leave_v to_o itself_o without_o disturbance_n do_v natural_o settle_v itself_o into_o a_o horizontal_n plain_n b._n he_o do_v not_o then_o as_o your_o author_n and_o all_o other_o man_n take_v gravity_n for_o that_o quality_n whereby_o a_o body_n tend_v to_o the_o centre_n of_o the_o earth_n a._n yes_o he_o define_v gravity_n to_o be_v a_o natural_a propension_n towards_o the_o centre_n of_o the_o earth_n b._n then_o he_o contradict_v himself_o for_o if_o all_o heavy_a
straight_a line_n from_o my_o eye_n to_o the_o sun_n terminate_v in_o the_o east_n b._n it_o be_v not_o due_a east_n but_o partly_o east_n partly_o south_n for_o the_o earth_n be_v but_o a_o point_n compare_v to_o the_o sun_n all_o the_o parallel_n to_o d_o e_z the_o aequator_fw-la such_o as_o be_v e_o a_o f_o b_o e_o g_o if_o they_o be_v produce_v will_v fall_v upon_o the_o body_n of_o the_o sun_n and_o therefore_o a_o b_o be_v north-east_n a_o a_o east_n north-east_n and_o a_o c_o north_n north-east_n a._n proceed_v now_o to_o the_o cause_n of_o attraction_n b._n suppose_v now_o that_o the_o internal_a part_n of_o the_o loadstone_n have_v the_o same_o motion_n with_o that_o of_o the_o internal_a part_n of_o the_o sun_n which_o make_v the_o annual_a motion_n of_o the_o earth_n from_o west_n to_o east_n but_o in_o a_o contrary_a way_n for_o otherwise_o the_o loadstone_n and_o the_o iron_n can_v never_o be_v make_v to_o meet_v then_o set_v the_o loadstone_n at_o a_o little_a distance_n from_o the_o earth_n mark_v with_o z_o and_o the_o iron_n mark_v with_o x_o upon_o the_o superficies_n of_o the_o earth_n now_o that_o which_o make_v x_o rise_v to_o z_o can_v be_v nothing_o else_o but_o air_n for_o nothing_o touch_v it_o but_o air._n and_o that_o which_o make_v the_o air_n to_o rise_v can_v be_v nothing_o but_o those_o small_a circle_n make_v by_o the_o part_n of_o the_o earth_n such_o as_o be_v at_o a_o b_o c_o for_o nothing_o else_o touch_v the_o air._n see_v then_o the_o motion_n of_o each_o point_n of_o the_o loadstone_n be_v from_o east_n to_o west_n in_o circle_n and_o the_o motion_n of_o each_o point_n of_o the_o iron_n from_o west_n to_o east_n it_o follow_v that_o the_o air_n between_o the_o loadstone_n and_o the_o iron_n shall_v be_v cast_v off_o both_o east_n and_o west_n and_o consequent_o the_o place_n leave_v empty_a if_o the_o iron_n do_v not_o rise_v up_o and_o fill_v it_o thus_o you_o see_v the_o cause_n that_o make_v the_o loadstone_n and_o the_o iron_n to_o meet_v a._n hitherto_o i_o assent_v but_o why_o they_o shall_v meet_v when_o some_o heterogeneous_a body_n lie_v in_o the_o air_n between_o they_o i_o can_v imagine_v and_o yet_o i_o have_v see_v a_o knife_n though_o within_o the_o sheath_n attract_v one_o end_n of_o the_o needle_n of_o a_o mariner_n compass_n and_o have_v hear_v it_o will_v do_v the_o same_o though_o a_o stone-wall_n be_v between_o b._n such_o iron_n be_v indeed_o a_o very_a and_o vigorous_a loadstone_n but_o the_o cause_n of_o it_o be_v the_o same_o that_o cause_v fire_n or_o hot_a water_n which_o have_v the_o same_o compound_a motion_n to_o work_v through_o a_o vessel_n of_o brass_n for_o though_o the_o motion_n be_v alter_v by_o restraint_n within_o the_o heterogeneous_a body_n yet_o be_v continue_v quite_o through_o it_o restore_v itself_o a._n what_o be_v the_o cause_n why_o the_o iron_n rub_v over_o by_o a_o loadstone_n will_v receive_v the_o virtue_n which_o the_o loadstone_n have_v of_o draw_v iron_n to_o it_o b._n since_o the_o motion_n that_o bring_v two_o body_n to_o meet_v must_v have_v contrary_a way_n and_o that_o the_o motion_n of_o the_o internal_a part_n of_o the_o magnet_n and_o of_o the_o iron_n be_v contrary_a the_o rub_n of_o they_o together_o do_v not_o give_v the_o iron_n the_o first_o edeavour_n to_o rise_v but_o multiply_v it_o for_o the_o iron_n untouched_a will_v rise_v to_o a_o loadstone_n but_o if_o touch_v it_o become_v a_o loadstone_n to_o other_o iron_n for_o when_o they_o touch_v a_o piece_n of_o iron_n they_o pass_v the_o loadstone_n over_o it_o only_o one_o way_n viz._n from_o pole_n to_o pole_n not_o back_o again_o for_o that_o will_v undo_v what_o before_o have_v be_v do_v also_o they_o press_v it_o in_o pass_v to_o the_o very_a end_n of_o the_o iron_n and_o somewhat_o hard_o so_o that_o by_o this_o press_a motion_n all_o the_o small_a circle_n about_o the_o point_n a_o b_o c_o be_v turn_v the_o contrary_a way_n and_o the_o half_n of_o those_o 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first_o endeavour_n of_o the_o movent_fw-la which_o endeavour_n how_o weak_a soever_o be_v also_o motion_n for_o if_o it_o have_v no_o effect_n at_o all_o neither_o will_v it_o do_v any_o thing_n though_o double_v treble_v or_o by_o what_o number_n soever_o multiply_v for_o nothing_o though_o multiply_v be_v still_o nothing_o other_o axiom_n and_o definition_n we_o will_v take_v in_o as_o we_o need_v they_o by_o the_o way_n a._n be_v this_o all_o the_o preparation_n i_o be_o to_o make_v b._n no_o you_o be_v to_o consider_v also_o the_o several_a kind_n and_o property_n of_o motion_n viz._n when_o a_o body_n be_v move_v by_o one_o or_o more_o movent_n at_o once_o in_o what_o way_n it_o be_v carry_v straight_o circular_a or_o otherwise_o crooked_a and_o what_o degree_n of_o swiftness_n as_o also_o the_o action_n of_o the_o movent_fw-la whether_o trusion_n vection_n percussion_n reflection_n or_o refraction_n and_o further_o you_o must_v furnish_v yourself_o with_o as_o many_o experiment_n which_o they_o call_v phaenomenon_n as_o you_o can_v and_o suppose_v some_o motion_n for_o the_o cause_n of_o your_o phaenomenon_n try_v if_o by_o evident_a consequence_n without_o contradiction_n to_o any_o other_o manifest_a truth_n or_o experiment_n you_o can_v derive_v the_o cause_n you_o seek_v for_o from_o your_o supposition_n if_o you_o can_v it_o be_v all_o that_o be_v expect_v as_o to_o that_o one_o question_n from_o philosophy_n for_o there_o be_v no_o effect_n in_o nature_n which_o the_o author_n of_o nature_n can_v bring_v to_o pass_v by_o more_o way_n than_o one_o a._n what_o i_o want_v of_o experiment_n you_o may_v supply_v out_o of_o your_o own_o store_n or_o such_o natural_a history_n as_o you_o know_v to_o be_v true_a though_o i_o can_v be_v well_o content_a with_o the_o knowledge_n of_o the_o cause_n of_o those_o thing_n which_o every_o body_n see_v common_o produce_v let_v we_o therefore_o now_o inquire_v the_o cause_n of_o some_o effect_v particular_a 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more_o than_o 29_o inch_n b._n and_o how_o broad_a a._n as_o broad_a as_o you_o will_v so_o it_o be_v broad_a enough_o to_o pour_v into_o it_o quicksilver_n and_o fill_v it_o with_o quicksilver_n and_o stop_v up_o the_o entrance_n with_o your_o finger_n so_o as_o to_o unstop_v it_o again_o at_o your_o pleasure_n then_o set_v down_o a_o basin_n or_o if_o you_o will_v a_o sea_n of_o quicksilver_n and_o invert_v the_o cylinder_n full_o as_o it_o be_v dip_v the_o end_n into_o the_o quicksilver_n and_o remove_v your_o finger_n that_o the_o cylinder_n may_v empt_v itself_o do_v you_o conceive_v i_o for_o there_o be_v so_o many_o pass_n by_o that_o i_o can_v paint_v it_o b._n yes_o i_o conceive_v you_o well_o enough_o what_o follow_v a._n the_o quicksilver_n will_v descend_v in_o the_o cylinder_n not_o till_o it_o be_v level_a with_o that_o in_o the_o basin_n according_a to_o the_o nature_n of_o heavy_a fluid_n but_o stay_v and_o stand_v above_o it_o at_o the_o height_n of_o 29_o inch_n or_o 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